Etymology
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Cepheid (n.)

type of variable star, 1904, from Delta Cephi, the name of the first such star identified, which is in the constellation Cepheus. With -id.

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Protean (adj.)

"of or pertaining to the Greek sea-god Proteus," 1590s, from Greek Prōteus, son of Oceanus and Tethys, who could change his form at will; hence, "readily assuming different shapes, exceedingly variable." His name is literally "first," from prōtos "first" (see proto-).

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